Accessory mitral valve tissue is a congenital non-syndromic heart malformation defined as an accessory mitral valve leaflet or various accessory mitral valve structures. It may be asymptomatic or present at various ages with symptoms of left ventricular outflow tract obstruction, low cardiac output due to subaortic obstruction or congestive heart failure. In some cases, it may be a source of cardioembolism. The malformation may be isolated or associated with other congenital heart malformations.
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familial mitral valve prolapse
MONDO:0008004
congenital anomaly of the mitral subvalvular apparatus
MONDO:0015109
mitral atresia disorder
MONDO:0015249
congenital mitral stenosis
MONDO:0020398
congenital hypoplasia of the mitral valve annulus
MONDO:0020399
congenital supravalvular mitral ring
MONDO:0020400